<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <script src="../../lib/jquery-3.4.1.js"></script>
    <link rel="stylesheet" href="../../lib/bs/css/bootstrap.css">
    <meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1, user-scalable=no">

    <style>

        .row{

            background-color: #8b8b8b;
            margin-top: 15px;
            margin-bottom: 15px;


        }

        .col-md-4{
            border: 1px #843534 solid;
            text-align: center;
            height: 40px;
            padding-top: 10px;
        }

        .col-md-3{
            border: 1px #843534 solid;
            text-align: center;
            height: 40px;
            padding-top: 10px;

        }

        .col-md-6{
            border: 1px #843534 solid;
            text-align: center;
            height: 40px;
            padding-top: 10px;
        }

        .col-md-8{
            border: 1px #843534 solid;
            text-align: center;
            height: 40px;
            padding-top: 10px;
        }



    </style>


</head>
<body>

<div class="container-fluid">

    <div class="row">

        <div class="col-md-4">三个小哥</div>
        <div class="col-md-4">三个小哥</div>
        <div class="col-md-4">三个小哥</div>


    </div>


    <div class="row">

        <div class="col-md-3">四个小哥</div>
        <div class="col-md-3">四个小哥</div>
        <div class="col-md-3">四个小哥</div>
        <div class="col-md-3">四个小哥</div>


    </div>


    <div class="row">
        <div class="col-md-6">两个小哥</div>
        <div class="col-md-6">两个小哥</div>

    </div>

    <div class="row">

        <div class="col-md-4">占据4份</div>
        <div class="col-md-8">占据8份</div>

    </div>




</div>






</body>
</html>